java - 单元测试 WatchService

Question

如何对这样的 watchservice 进行单元测试:

/**
 * Function to look for changes in a determinate directory
 * @param directory is the directory where to look for the changes
 * @return return a boolean that is true if have changes or false if not
 */

private static boolean watchDirectory(final String directory){

    boolean flag = false;

    Path path = Paths.get(directory);
    try {
        // get watch service which will monitor the directory
        WatchService watcher = path.getFileSystem().newWatchService();
        // associate watch service with the directory to listen to the event types
        path.register(watcher, StandardWatchEventKinds.ENTRY_CREATE);
        System.out.println("\nMonitoring directory for changes...");
        // listen to events
        WatchKey watchKey = watcher.take();
        // get list of events as they occur
        List<WatchEvent<?>> events = watchKey.pollEvents();

        for (WatchEvent event : events) {
            flag = false;
            //check if the events refers to a new file created
            if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE) {
                flag = true;

                System.out.println("Created: " + event.context().toString() + " ;");
            }
        }
    } catch (IOException | InterruptedException e) {
        e.printStackTrace();
    }
    return flag;
}

它正在寻找目录中的更改，如果创建了新文件，它将返回一个值为 true 的标志，如果我没有找到更改，则返回该标志为 false。

Answer 1

您可以使用JUnit来测试WatchService。

引用:https://github.com/bbejeck/Java-7/blob/master/src/test/java/bbejeck/nio/files/watch/WatchDirectoryTest.java